Safety gas valve



W. T. SIVIITH.

SAFETY GAS vALvE.

APPLICATION FILE, 0CT= 2, |920- l A II. ,@0353531, Y Paguented Jan. 10, )1922.

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' INVENToR BY A@ A1'I'ORNEY WITNESS:

W. T. SMITH.

SAFET Y GAS VALVE.

APPLlcMloN man ocr. 2, 1920.

l 35 11 o Patented Jan. 1922.

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UNH i f R y M BY a narran stares SMITH, 0F COTESVILLE, PENNSYLVANIA, SSIGNE @E @NE-HALF T@ WILLEAM R. THOIJEAS, OIF PHELAD'ELPHIA, ENNSYLVAlgIA GAS VALVE.

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Speciiication of Letters atent.

Patented plran. 101, 192:2.

Application filed october 2, 1920. Serial No. amd64.

To @ZZ whom/13 may concern:

ne it known that l, Wniniaai T. Srarrir, a citizen ofy the United States, residing at Coatesville, in the county of Chester and State of Pennsylvania, have invented new and useful improvements in Safety (das llalves, (Case A,) of which the following is a specification.

The present invention has reference to n nprovements in gas burners, and has for its object to provide such burners with means tor closing the valves thereof to prevent. the passage of gas therethrough, when the light from the burner has been extinguished.

further object is the production of a safety gas burner which shall be of a comparatively simple construction and which will automatically iniuence thel valve thereof to a closed position when the light at the tip of the burner has been extinguished accidentally or otherwise.

A further object is the production of a safety gas burner which will be positive 1n action for automatically influencing the valve therein to a closed position when the gas light has been extinguished.`

rllhe foregoing, and other obyects which will appear as the nature of the invention is better understood, may be accomplished by a construction, combination and operative arrangement of parts, such as is disclosed by the drawings which accompany and which form part of this application.

In the drawings Figure 1 is an elevation of an automatic safety gas burner constructed in accordance with this invention.

l Figure 2 is a sectional view approximately on the line 2-2 of Figure 1.

Figure 3 is sectional view approximately on the line 3-3 of Figure 2.

Figure l is a sectional view approximately on the line l-l of Figure 1.

Figures 5 to S illustrate details.

llhe body of my improvement is in the nature of a casing and is indicated by the numeral 1. rEhe body may have a longitudinal passage therethrough whose ends are threaded when it is desired that the burner be screwed on the ends of sections in a pipe line through which the gas is conducted. However, Lhe body may only have arranged therein a poclret 2 which enters from one of the ends thereof, and the outer portion of the said pocket is round and provided with interior threads 3 so that the body may be screwed on the gas conducting pipe. The bottom of the body is preferably provided with a threaded opening which communi- Cates with the poclret Q, the said opening being closed by a threaded plug 5. The plug, on its inner face has a central socket 6 therein the walls of which provino a guide for one end of a stem 7 of a valve 8 which controls the passage of the gas through the pocket to the burner tip. The stein 7 is surrounded by a spring 9 that exerts a tension between the valve 8 and the plug 5 so that the valve is normally retained on its seat 10. The seat is preferably in the nature of a removable member which is threaded in an opening 11 disposed directly opposite the opening 4. The seat also provides a guideway for a. stem 12 that projects from the valve in an opposite direction from the stem 7, and this last mentioned stein is provided with a plurality of preferably spil-ally arranged grooves 13 that provide passages for the gas when the valve is unseated.

Screwed in the opening 11 of the body is a tubular gas burner 1d. The burner has, adjacent its outer open end, an inturned flange l5 on which the stone tip 16 of the burner is seated. Communication with the slit which provides the gas passage through the burner tip 16, and secured in the said tip, in any desired or preferred manner, is a gas tube 17. This tube is arranged centrally in the tubular member 14. the latter being in the nature of a jacket which is contacted by split friction rings 18 arranged in grooves 19 on the outer periphery of a cylindrical plunger 20. The upper end of the. plunger is centrally provided with an opening for the passage of the gas tube 17, and its lower closed end centrally provided with a. gas tube 21 that telesfopically receives therein the gas tube 17. The tube 21 is provided with a plurality of openings 22 adjacent to its lower closed end.

The plunger member has arranged therein a semi-liquid body 26 which is highly susceptible to expansion from the heat of the burner but which is also highly susceptible to contraction from the cold. Surrounding the flutcd or grooved stem 13 of the valve 8, the apertured projecting end of the gas conducting tube, and exerting a pressure between the seat 10 and the hollow plunger 20 is a spring 27.

Having a yolred end which is freely received in a groove in the widened upper porllO tion or the lower stein 7 oi the valve 8 is an arm 28. This arm is centrally connected to a shaft 29 that has one of its ends journaled in one oif the walls of the pocket 2 and its other end projecting` through a stu'liing box 30 in the opposite end oi the body that communicates with the pocket. rEhe last mentioned end oi the shaft has an angular extension 3l to which is connected a pull chain 32. ltwill be apparent that when pull is exerted on the chain the shatt will be turned so that the forked arm thereof will be swung downwardly .in the pocket 2 causing the valve 8 to be unseated. 0n the side ot the body through which the shait extends there is secured for slidable movement in a bracket a springinluenced pin 3e. This pin is designed to be received through one of the links of the chain 32 and hold the valve unseated, so that the gas will flow through the pocket 2 of the burner, through the spiral `grooves in the upper stem oitl the valve, through the openings in the lower lgas tube, and through the upper gas tube. This permits of the gas being ignited. The gas soon heats the tip 16 and the jacket 14, so that the Huid '26 in the member which I have termed theA plunger will be expanded, which causes the lower closed end ot the gas tube connected with the plunger to Contact with the upper stem of the valve, moving the valve Astill further away from its seat. long as the fluid is expanded, thus forcing downwardly the plunger to engage the valve stem, the valve will be held unseated. The gas can be extinguished by again operating the shaft to close the' valve, or should the gas be accidentally extinguished, the fluid in the plunger will be immediately contracted which permits of the spring 27 to move the same upward in the direction of the tip, allowing the spring 9 to againl hold the valve seated.

' Having thus described the invention, what l claim, is y v1. In a device of the class described, in combination with a casing, of a tubular gas burner extending upwardly vfrom the casing, a gas tip therefor, a cylindrical plunger disposed in said burner, a gas delivery tube extending through the plunger, having a plurality of apertures formed therein and provided with a lower closed end, a tube secured to said tip and extending into the upper end of the first mentioned tube, a valve in said casing having a stem extending into the burner adjacent to the plunger', expansive matter in the plunger adapted to move the same into valve contacting position, spring means to return the plunger to normally inoperative position upon contraction oi the expansive matter, and independent spring means to normally retain the valve seated when the flame is extinguished.

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tures formed therein and 'provided with lower closed end, friction rings arranged on the outer periphery oi" said plunger, spring means to retain the plunger in its normal inoperative position, expansive matin the plunger adapted to move the same against the tension of its 4spring,r spring means to return the valve to its normal seated position upon contraction ot the expan- ,sive matter', valve actuating means projecting through the casing 'for regulating the initial. -l'iow of gas and'latching means therefor to cause the valve aforesaid to remain unseated until contact with said plunger is consummated.

in a device of the class described, in combination with a casing, ot a tubular gas burner extending upwardly romthe casing, having an 'annular flange integrally formed adjacent the end thereof and projecting inwardly, a stone tip for the burner seated on the flange, a gas delivery tube projecting` inwardly from said tip, a cylindrical vplunger disposed in said burner, a tube Vtelescopically receiving the gas tube, extending through the bottom of said plunger, having a plurality ot apertures :termed therein and provided with a lowerclosed end, friction rings arranged on the outer periphery of said plunger, a valve seat in said casing, springmeans extending from the upper surface thereof to retain the plunger in normal inoperative position, a valve having a grooved stem projecting into the burner, the end thereof being adjacent to the closed end of the plunger, expansive matter in the plunger adapted to move the same against the tension or" its spring intol engagement with said valve stem to unseat the valve and cause the same to remain open while the burner 'is subjected to the action of heat, said expansive matter also susceptible to contraction when the flame from the gas is'extinguished to l permit of the spring means seated in thebase oi" the casing to retain the valve normally seated, means projecting through the casing for operating said valve against the tension or its spring, and latching means for the valve opening means to hold the valve unseated until the plunger engages the valve stem and regulates the same after the burner is lighted.

In testimony whereof affix my signature.

WrLLrai/r rr. surtir 

